We got some news about the upcoming 4GB DDR3 kits. Corsair have them in works and it even sampled a few of its loyal testers with it.
The memory is branded as CM3X2048-1600C7DHX and you get the whole 4GB.
It works at CL 7-7-7-20 and it can hit DDR3 1600 speeds and works at
800 MHz clock.
We can assume that it will cost close to $1000 for a kit if not even
more but the good news is that if you have the money the 4 GB kit will
be out in the wild for you.
You can check some nice pictures
here.